Protective helmet



FIG. 1 is a top perspective view of a protective helmet incorporating the design of the present invention;

FIG. 2 is a bottom perspective view of the protective helmet of FIG. 1;

FIG. 3 is a front view of the protective helmet of FIG. 1;

FIG. 4 is a rear view of the protective helmet of FIG. 1;

FIG. 5 is a top view of the protective helmet of FIG. 1;

FIG. 6 is a bottom view of the protective helmet of FIG. 1;

FIG. 7 is a left side view of the protective helmet of FIG. 1;

FIG. 8 is a right side view of the protective helmet of FIG. 1;

FIG. 9 is a perspective view of an alternate protective helmet incorporating the design of the present invention;

FIG. 10 is a bottom perspective view of the protective helmet of FIG. 9;

FIG. 11 is a front view of the protective helmet of FIG. 9;

FIG. 12 is a rear view of the protective helmet of FIG. 9;

FIG. 13 is a top view of the protective helmet of FIG. 9;

FIG. 14 is a bottom view of the protective helmet of FIG. 9;

FIG. 15 is a left side view of the protective helmet of FIG. 9; and,

FIG. 16 is a right side view of the protective helmet of FIG. 9.

The broken lines shown in the drawings depict portions of the protective helmet that form no part of the claimed design. 

CLAIM The ornamental design for a protective helmet, as shown and described. 